Window insulating spacer



FIG. 1 is a perspective view of the window insulating spacer;

FIG. 2 is an end elevational view showing the configuration of the top wall;

FIG. 3 is a side view of the window insulating spacer;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The article has been shown broken away to show indeterminate length. 

The ornamental design for a window insulating spacer, as shown and described. 